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JSC2011-E-029068 (21 March 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, is pictured during a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-029070 (21 March 2011) --- NASA astronaut Doug Hurley, STS-135 pilot, participates in a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-029071 (21 March 2011) --- NASA astronaut Doug Hurley, STS-135 pilot, is pictured during a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-029074 (21 March 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, participates in a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration